I Saw It On The Steam Community. Click On The Steam Icon On Your Computer. Go To Store And Search "Portal". Don't search Portal 3 or it wont work. just search "portal" and scroll down till you see something that reads: conversion 2015 demo. its based on what happened while Chell was in cyrosleep and why the facility is in old, ugly, and abandoned. There are also two new Cores! Cant wait till 2015!

It' s not a Mod and it' s not by Valve. It' s by Hidden Valley, but it' s it' s own game, that will be based on Portal and play after Portal 1, but before Portal 2. But because of new elements, new characters and a new lost aperture gameplay, you can also see it as a portal 3.

It`s a mod. WHATEVER... I HEARD FROM MULTIPLE SOURCES THAT PORTAL 3 , HALF-LIFE 3 AND LEFT 4 DEAD 3 WILL BE ON SOURCE 2. AND IS POSSIBLE THAT VALVe will release one of this 3 games this year. Surely Half-Life 3.